Regulation of dynamo-electric machine.



No. 890,722. PATENTED JUNE 16, 19 08.

0. P; STEINMETZ.

REGULATION OF DYNAMO-ELEOTRIG MACHINES.

APPLICATION FILED AUG. v. 19o5. RENEWED JAN.81,1908.

U1 Tier) STATES CHARLES i. STEINMETZ, or SGHENECTADY, new YORK, Assio'son ire czar;

COMPANY, A CORPORATION 01." NEW YURLL.

Specification of Letters Patent,

Patented. 3mm 16, 19051.

Application filed August 7, 1905, Serial Ne. 272,933. Renewed Eennary 31, 13823. Eerie! ll'o. 5213,610.

To all whom it may concern:

Be it known that 1, CHARLES P. STEIN- ME'IZ, a citizen of the United States, residing at Schenectady, county of Schenectady, and

.5 State of New York, have invented certain new and useful Improvements in Regulation of Dynamo-Electric Machines, of which the following is e specification.

My present invention relates to the generation and distribution of alternating currents and has for its object the provision of means whereby the Voltage of the generating source may, he maintained constant with variation of loud, or if desired ins-y be made to rise as the iced comes on, in order thereby to mein- #toin cisistsnt potential at some more or less dist-out point on the distribution system. In marrying; any invention into emotion I make use oi e generator having its held mem her excitei'l hy low frequency multiphase alternating eurrm'ils. The exciting circuits carrying the low frequency currents are connected to a suitzrble exciting machine of the desired low frequency, soy four and six cycles per second, and in the leads extending to this exciting imichinc l cimnect in series suitable ad'usteble resistances.

' f'the rotating member of the cnerutor he now rotated in such a manner that currents produced in the generating windings ol' the generator have n frequency corresponding to the difference of the two .l'roqucnrics duo respectively to the nicchunimil rotation in the machine and to the rotation of the iicld due to the exciting currents, then the generator operates after the manner clierzicteristic of an induction motor driven uhoyc syncluonism. In this case thrtwo members of the generator such. generate current which [lows 40 in the case of one mcmlmr to the distribution circuit and in the case of the other member to the exciter. The currents ilos ving' to the on citor traverse the resistances in the cxci circuits and thereby drop in potential so that it will be soon that thcyoltsge of the cxciter circuit nexu the generator is higher than at the excitcr. As the m l-rent delivered by the main generator to the distribution system in creases in value the current'tlowing into the excitcr circuit from the generator increases correspondingly in value because the currents in the rotor andstutor of the main generator are produced by the same flux. Therefore a. the loud on the inuin gene-rotor iucrcr the voltage supplied to the cxcitcr circuits by- 55 the main generator increases likewise, whie the volt-e e supplied to the consumption oi cuit of t re main generator also increases. Now by varyin the resists co in the excite! circuit it is eviocnt, assuming the voltage of the exciter to he maintainedconstant or up proximately so, that the voltage oi the main generator. may thereby be adjusted This result I accomplish by automatic moons rcsponsive to the volts oi that portion oi the distribution system at which it is desired to maintain a constant potential.

As to the featu es of novelty which char-- uctcrize my int'cn on i have endeavored to point these out with ,isirticulurity in the :2. l pended claims.

For a betterurulcrstzuiding oi the invention itself, reference is to be made to the croonipsnying draw ngs when in connection with the following s1 cilio-ition.

in the drawings, the 11min nlliornnting current generator is indicated in general at 1 and consists in the present instance, of Lt nmchiuc resembling in .erui construction an ordinary induction motor. Each of the two members of the machine is provided with :1. multiphase winding, in this case a. threephusc winding.

ihc threc-phuse tormimds extending from the stator oi the machine are indicated at 2, I, and l, respectively, while 8 the three-phase terminals iron: the rotor are indicated at 5, l3 and 7 and connect through suitzihlc collector rings :Lllll brushes 3%, 9 and ill, to points in the winding on the rotor ll.

The machine iziy he driven from :my suite able si'iurre oi poxwr, as for c to, h means of a belt l2.

The ststor is in the prcscni instance es the generating member oi the machine and the leads therefrom connect to any suitshlc distribution system indicuicd in the present instance as supplying hunks oi hrmps 13, M: and 15 and motors, such ior iwemple the induction motor 16. Those trunslutinu do vices are merely illustrative of some suitable ll) loud.

The rotor of the machine, which serves in the present instance as the exciting member, is connected through. its loads 5, 6 and 7 to the exciter l? of low frequency multiphase currents, T s exciter may he of any suit sired value of voltage, While when the refrequency multiphase e tsnces short-circuited either in Whole 'llhc direct it field or in part the voltage will tend to fall conpresent siderslily below the desired value. New

. 'ct e nt assuming the parts to be in the position ends of which are indiczued indicated in tile drawing, in which the ren the ex .lter lecds 6 and 7 sistzu'iccs are open circuited, it will be seen won. the generator and exthe thcvoltagc on the regulating magnet 38 '0 re lVQlIjT in series I tend to increase shove normal. The

' 1c is .2 and i 101; V7 thus increase in strength and nui be adjusted withdrew armature 40, thereby sepcrst- '75 of sl'iilftsblc con in the contacts All and 42 and thereby de- L order to ed M izing the rel magnets 32, 34 and 35.

to ires of these magnets Will then be L by their controlling springs and use circuit about their respective The voltage of the main gonthen tei'irl to fall and thereby nuignet 38, whereupon the crime- -,,u1 "net moves away and closes :i'd The relays then act 8 to on :jzdjt' to open rt-circuits about the resistl. urgestli since ns operation is repeated with such i'ies', mph 7 l M, thevoltageof the main. generait 1 Q tor h: no time to vary appreciably from a iue, and EL matter of fact, it is rzictive that the vibrations of the regulator are so irend to nuiintain e practically constant voltage. The slight vcriw tions of voltage, to which the vibration of the regulator is due, are practically indistin ie regulating magnet 38 g lilting resistance may 05 with SllOl'lL-(iu'- which cciil .i u

portaon olf the system the some is chairbs conn c ibed, require no maintainconstant po. 100, are indicated st 1 'c A be connected either at l I "s or it n'isly bo,.con-

c responsive to the Voltage M: t, ed in sci 2s and point of the system. Howi i suitable scurc i conne ed it operates to maintain ..i:iter l8. ore int voltage at the point to which it is to nuigi'iets i nmlie use of mortc-d.

ring of IL uu'w'net lllmt l. laiin as new, and desire to secure l two oi the .leds oi the by Letters Patent ol the United States, is,*-

nd coii pei'u Mug Willi c 1 .llie combination ol' 9, dyncinoelectric a" or 'llus chine hnvmg c multiphase exciting windid as. u'iultiphsse generating winding, 1], 7 101145;" exciting circuit connected to Minding, voltage consuming degc-et e and also it nos ierclu or eugsgin an cda, llhen th com s in said e citing circuit, and means renlf, till?! the relay magnets 35., 23 sponsivo to variation cl voltage of stud gensi'c c =eigizcd and thereby attract crating winding for controlling said voltzige ccri'csp v'ng arms-lures, thus open con uming devices. ting the shunts abou the respective The combination of a, dynamo electric recs 2]., :n'ul L0. The entire resist machine having a multiphase exciting Windhis in circuit When the coning and a multiphase generating Windin a srptuste the role? iligllQtS loiv frequency exciting circuit connectec to sand rcssid exciting winding, resistances in said ex.

' ng circuit, and means responsive to the oltuge of said generating Winding for con- In Witness whereof, I have hereunto sci;

my hand this 4th day of August, 1905.

CHARLES P. S'lEINIvlE'l J. W i tncsses:

BENJAMIN B. HULL, MABEL F. HUL 

